Mr Clegg said: "Vladimir Putin, who has been the chief sponsor and protector of one of the most brutal dictators on the face of the planet, President Assad, who has blocked at every single turn in the United Nations any attempt by the international community to work in concert to help the many, many millions of people who have been driven from their homes and have been brutalised, and have been tortured and have been killed.

"And to then express his admiration by saying that he thinks that Vladimir Putin has played it all as if it's a game. This isn't a game. This is thousands upon thousands of people being killed and brutalised and murdered and chased from their homes who we are now taking into our country.

Nigel Farage on Nick Clegg: 'A very nice guy, but wrong'

"Women and children who have been sexually abused, who have been physically abused, and we are thankfully acting in a generous-hearted way to provide them refuge.

"And he admires the man who has allowed, more than almost any other world leaders, that to happen?"

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Gallery: Vladimir Putin - Man Of Action

Vladimir Putin has earned a reputation as something of an action man. Here in 2013 he is seen shaking hands with a walrus on a visit to the under-construction Primorsky Aquarium.

Mr Farage had less praise for his political opponents in the UK, branding David Cameron as "a perfectly nice fellow who stands four-square for nothing".

He said Ed Miliband was a "nice chap, not very worldly - I would love to see him in a working men's club in Newcastle".

Fresh from his apparent victory over Mr Clegg in a public debate on Britain's membership of the EU, broadcast by LBC Radio and Sky News last week, he said the Lib Dem leader was a "very nice guy, just wrong".

The UKIP leader said he did not approve of Mr Putin's annexation of Crimea, but said EU leaders had been "weak and vain". He added: "If you poke the Russian bear with a stick he will respond."

Asked by Tony Blair's former director of communications Alistair Campbell in an interview in GQ magazine which current world leader he most admired, Mr Farage replied: "As an operator, but not as a human being, I would say Putin.

"The way he played the whole Syria thing. Brilliant. Not that I approve of him politically. How many journalists in jail now?"

Mr Putin has been criticised for supplying arms to Bashar al Assad's regime and his attempts to block United Nations moves for sanctions against the Syrian president.

However, the Russian leader was credited with outmanoeuvring the West last year when he brokered a deal for Syria to give up its chemical weapons.

Mr Farage was less complimentary about Germany's Angela Merkel saying: "She is incredibly cold. I always say - I agree this is a bit rude - but whatever you think of the public image of Merkel, in private she is even more miserable. I warm to more extrovert people."

On the domestic front he said that there was "absolutely no doubt at all" Mr Cameron had offered a referendum on Britain's EU membership because of pressure on his party from UKIP.

After Mr Miliband recently said he would only offer a referendum on EU membership in the unlikely event Europe attempts a power-grab, the Prime Minister has painted the Tories as the only party that would guarantee a vote on Europe ahead of the 2015 election.

However, this does not make Mr Farage a natural Conservative supporter and when asked who he would like to win the election he said: "I don't care ... If I was back in the London Metal Exchange I'd not give a toss, because 100% of the legislation affecting me is made in Brussels."

Pressed to choose either Mr Cameron or Mr Miliband, Mr Farage said: "Don't give a damn. Ed has come up with some pretty bonkers ideas."